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I don't see off-hand why that wouldn't work. The code I suggested had a case mismatch for the M. Perhaps it is a timing problem, that it tries to run before the page is fully loaded.

It's possible I made more changes than necessary, since it never worked. I eventually placed an alert in the function, which showed it was being called. I would have to analyze the function more closely to determine what didn't work.

I proposed to do this only in the page after continuemove

In that case, you should make use of ask to spell out the optional moves and ask which one the player wants to make.

so in both cases we are dealing with expressions that are evaluated.

So that expressions may be passed to cond in an unevaluated state, this particular operator is able to trigger the evaluation of an array as an expression. This is not the usual default behavior, and in set v1 (a b);, the array inside (a b) is not evaluated as an expression. The default behavior is to not evaluate an array as an expression, and it is by means of this that two expressions may be passed to cond without being evaluated first. This allows cond to be used in recursive functions.